Only Grandmothers buy this junk…

This is pretty neat, almost as good as the “steaming cup of coffee commercial.” (If you haven’t seen it yet, check below)
MugMouse is a simple, playful idea, using your coffee mug as computer mouse. MugMouse rethinks the way people work at computers by making it easy to build slowness into your daily activities.

MugMouse plays on the idea of deliberately choosing to use a slower mouse for a while. Filled with tea or coffee you have to move it more carefully than a normal mouse. Do certain tasks at the computer deserve a bit more time, reflection or personal involvement? Checking your email, visiting your favourite website or blog, reading the daily news, shopping etc. MugMouse can be seen as a reward; serving as a signal to yourself and others that you are having a little time away from your work.

You click by pushing the whole mug towards the table. It clicks very easily. The whole bottom of the mug is the mouse button.
It works on infrared and it connected by USB.
It holds about 150 mL of your favorit hot drink.